What is a spindle?

Spindles are one of the most important components in any custom-built staircase. Without them, your staircase wouldn’t just look unfinished, it could be unsafe too. But ask the average person on the street and they probably wouldn’t know what one is!

In this guide, we’ll answer the common question: what is a spindle? We’ll also explore the different types of stair spindles, explain how they fit into a balustrade, and offer expert tips to help you choose the right design for your home. Read on to learn more.

What is a spindle on a staircase?

A spindle is a vertical post that supports the handrail of a staircase. Also known as a baluster, it plays a crucial role in both the structure and safety of your staircase. The primary job of a stair spindle is to prevent people – especially young children – from falling through the gap between the steps and the handrail.

But spindles aren’t just practical. They also offer a chance to add character, contrast, and visual flow to your staircase. Different kinds of spindle can define the overall look of the staircase: classic, contemporary, or something more unusual.

What is the difference between a spindle and a baluster?

While “spindle” and “baluster” are often used interchangeably, there is a slight difference in how they’re used. Technically, “baluster” is the architectural term for any vertical support within a balustrade, which can include columns or posts made from a range of materials. “Spindle” is more commonly used when referring to thinner, more delicate upright pieces especially in timber staircases.

In practice, most people use the word “spindle” when talking about residential stairs and handrails, while “baluster” might appear more often in architectural drawings or commercial contexts.

What is the distance between spindles on a railing?

The spacing between stair spindles isn’t just an aesthetic decision; it’s a safety requirement. In the UK, spindles have to be installed according to the “baby’s head rule”, which means that the gap between spindles shouldn’t be big enough for a baby’s head to get through – or, as the regulations themselves put it, you have to “ensure that a 100mm sphere cannot pass through any openings in the guarding” (Section K1, 1.39a). This, of course, is to prevent the possibility of accidents.

That means the number and positioning of spindles will depend on the total length of your handrail and the specific layout of your staircase. In curved handrails and staircases, for example, the angles and spacing may vary slightly, which is why a bespoke design is often the best approach.

At Handrail Creations, we use digital surveys to measure every aspect of your staircase with precision, allowing us to manufacture perfectly spaced spindles that comply with regulations and look exceptional.

Common types of stair spindles

From traditional wooden spindles to sleek, contemporary metal options, there’s a wide range of spindle types to suit every staircase design. Here are the most common:

Wooden stair spindles

When it comes to stair spindles wood is the timeless choice, and wooden spindles are probably the kind you grew up with. Oak, ash, walnut, and other hardwoods are frequently used for their natural grain and strength. You can stain, paint, or oil wood to match your interior design, or leave it raw for a rustic farmhouse finish.

Tapered spindles or fluted and twisted shapes can make a staircase feel more decorative, while simpler square or chamfered profiles are more minimal. And because they’re easy to customise, wooden spindles remain one of the most flexible options available.

Metal stair spindles

Metal stair spindles are a popular choice for modern homes and commercial spaces, and for those who want a staircase design without newel posts. Typically made from mild steel or stainless steel, they are strong, durable, and generally have a minimalist look. You can choose from plain, square-profile spindles for a simple effect or more decorative, forged designs with scrolls or twists for added impact.

Struggling to choose between wood and metal for your staircase balustrade? Learn more about the pros and cons of both materials in our guide to wooden vs metal handrail design.

Cast iron spindles

Steel isn’t the only material used to create metal stair spindles. A more traditional option is to install cast iron spindles, which are often seen in period properties or restoration projects. 

In addition to their substantial weight and durability, cast iron spindles also offer a timeless, classic feel and the perfect opportunity for intricate detailing, including the addition of scrolls, floral motifs or geometric patterns that echo Victorian and Edwardian styles. However, when paired with contrasting materials like glass or light wood, cast iron spindles can also be part of a stunning modern staircase.

Other stair spindles

While wood and metal are by far the most common materials, there are other spindle types you might occasionally see.

• Glass spindles – A modern choice that lets light flow through your staircase. Best used in minimalist or high-spec interiors. Having glass panels rather than spindles is more common.
• Acrylic spindles – Uncommon but not unheard of, these are see-through like glass spindles but can be twisted like metal.
• Brass or bronze spindles – Warm, characterful metals that age beautifully and add a touch of class to your staircase.

If you’re considering something a little different, we can help you weigh up the options and make sure that whatever you choose is both safe and beautifully made.

Choosing the right stair spindles for your home

When choosing spindles, it’s worth thinking beyond the material. Consider how your staircase fits into the wider context of your home. Do you want it to stand out as a feature, or blend in with the architecture? Would clean lines work better than curves? Is the space bright and modern, or warm and traditional? You can learn more about choosing the right style for your home in our balustrade and handrail design ideas for traditional and modern hallways.

If you’re unsure where to begin, try identifying one or two elements in your home – like flooring, door handles, or furniture – and choose a spindle material or finish that complements them. Mixing materials, like metal and timber, can also create a layered look that feels considered without being overly complex.

We’re here to guide you through every step of the process. With experience in everything from listed buildings to contemporary loft apartments, we can help you refine your vision and select the right spindles for your needs.

Speak to the experts at Handrail Creations

If you’re ready to take the next step, we’re here to help. From design advice to detailed technical planning, our team brings years of experience in crafting bespoke handrails and spindle systems for residential and commercial properties alike.

Whether you need a classic wooden staircase or a minimalist glass-and-metal balustrade, we’ll work with you to bring your ideas to life, right down to the last spindle. Get in touch with Handrail Creations today to discuss your project.